Improvement in steam-pumps



UNITED STATES PATENT DFFIGE. v

JOHN TESSEYMAN AND EDWARD E. BARNEY, OF DAYTON, OHIO.

IMPROVEMENT IN STEAM-PUMPS.

L Specification forming part of Letters Patent No. 154,102, dated August11, .1874; application filed June 17, 1874.

To all whom it may concern:

Be it known that we, JOHN TESSEYMAN and EDWARD E. BARNEY, both ofDayton,

operated by the. reciprocating piston-rod of' the steam-cylinder withoutthe intervention of a crank-shaft; and our invention consists,

first, of a certain combination of gravitating slide, carrying acrank-wrist to operate the valve, and a partiallyrotating andreciproeating disk, in which this slide operates, the disk being movedby direct gearing, lever, or link connection with the piston-rod, andoperating, in its rotation through the slide, to give therequired motionto the valve, the gravitating character of the slide serving to sochange the location of the crank-wrist at the proper time as to give thenecessary lead of steam at the end of the stroke, and enable the motionof the piston on the return stroke to open the valve to the fullestextent. Our invention consists, in the second part, in the provision ofa spring, in connection with the slide, by which it may be more forciblyand definitelyoperated as to precisetime of movement than gravitationcan alone provide for. Our invention consists, in the third part, of adash-pot or cushion in connection with the slide, by which the. movementof the latter may. be cushionedin completing its stroke across thepartially-rotating disk. Our invention further consists of a curvedguide for definitely. controlling thelength of stroke of the engine, andof relief-spaces on said. guide for enabling the cuttingotf of the steambefore the termination of the stroke.

Figure 1 is a perspective viewof a steampump embodying our invention.Fig. 2 is a section of the valve-chamber and driving mechanism in aposition at the-beginning of the stroke. Fig. 3 is a sectionof thevalveohamber and driving mechanism in a position at the middle of thestroke. Fig. 4 exhibits the curved guide constructed to cut off steambefore the termination of the stroke. Fig. 5

illustrates a modification in the construction of a part of thevalve-gear.

A is the steam-cylinder, and B the steam.- pump. The latter may be :ofany preferred construction, and may be, in fact, omitted, and in placethereof our. steam-cylinder and valve-operating mechanism maybe appliedto a crank-shaft: or. other steam-engine appliance. (l isthe piston-rodof the engine. D is a disk or crank-plate, journaled in suitablebearings in the' frame of the machine, and adapted, when in operation,to partially rotate in both directions. connection with thereciprocating piston-rod O, anditis obvious, that there are many ways bywhich the connection may be made to give the required motion to thedisk. D'such, for example, as a gear-wheel on the disk-shaft, and a rackon. the piston-rod.but in order that the distance between the pump anden-' gine may be as-short as possible, we prefer to attach a slottedlever, E, to the disk-shaft, and to project from the piston-rod a stud,G, to engage in. said slot. With this connection. the rectilinearmotionof the stud G will produce a vibratory curvilinearmotion in the lever. His the valve of the engine,which, as shown, may be theordinaryslide-valve so much pre ferred byexperienced engineers, by reason of itsextreme reliability and durability, andlwe' prefer to use abalancedslide-valve for this purpose, so as to: avoidexcessive frictionon the valve -moving appliances. The steamportsII.,andthe exhaust-portsunder the valve, are arranged in the ordinary way for commonslide-valves. Across the face of the diskor crank-plateD We cut agroove, d, preferably dovetailing, and insert therein a slide, F, which.carries thecrank-wr'ist J, to which the pitman K of the valve-rod L isconnected. 4

The rotative-imotion'of this slide serves to enablethe crank-wrist toincrease the width of the opening of the steam-port as the pis ton movesoff fromthe end of the stroke, and to close or partially. close thesame. before the termination of the stroke, and the-motion of the slideacross the face of the crank-plate serves to entirely close the port atthe termination of one stroke, and to open the opposite portsufficiently to give the required lead It is operated by direct.

of steam for the return stroke, and not only this, but it so changes thelocation of the wrist J with relation to the center of the disk-shaft,as to place the said wrist on the side of the shaft, which gives theproper direction of motion to enable said wrist to continue the openingof the port as the stroke progresses.

. Owing to the weight and consequent gravi= tating character of theslide F, (and the same effect maybe, of course, produced by a spring,)if the disk-shaft should be vertical, the slide, as it approaches thevertical position in the rotative movement of the disk or crank plate D,moves across the disk so as to cause the wrist to occupy a position onthe other side of the shaft of Y the disk, and to close the port whichhas furnished steam for one stroke,

and partially open the port to supply steam for the return; and toperform all this it is only necessary. absolutely to use the partsalready described, the slide being, of course, provided with stops tolimit its motion across the disk. We have hadpumps in operationsuccessully-in which these parts have alone been use r The stops weprefer to use are attached to and project from the rear of the slide F,so as to project over therear edge of the disk.

These stops are shown by the letters f f in the. drawings, and each ismade to enter a notch in the face of the disk when it moves "inward. Inaddition to these parts, however, .we prefer, for reliability ofslide-movement, to employ a spring, M, to move, or assist in moving, theslide F at proper time, and to avoid concussion in the movement of theslidewe prefer to use a'cushion or dash-pot, N; and to insure accuracyin length of stroke of the piston we prefer to combine the slide Ff fwith a curved guide, P. The spring is secured to the wrist J by a rod,Q,'the spring resting, at its upper end, against the top of thecushion-chamberN. At the lower end of this same, rod the piston n ofthe. cushion is secured, and adapted to slide accurately in thecushion-chamber, and form, thereby, a

component-part of the cushion.

As the slide' is moved for the termination and commencement of eachstroke the. piston is cushioned on the air contained in thechamber,and-violent concussion of the slide against its stops isprevented. The ends of the guide P serve to indicate and determineexactly at what point-the slide shall move, and the thickness of theguide governs exactly the degree of opening given to the ports of i thevalve. It is so arranged that when the disk moves in the direction ofthe arrow, Fig. 3, the stop f rubs against the outside of it, as shown;and when the direction of motion is reversed the stop rubs against theinside, as it is about to do in Fig. 2.

In order that this guide may cut off steam at any "preferred point inthe stroke, after the middle, we cut relief spaces 11 from the guide P,and these act in the movement of the disk to allow the slide to closethe valve at the time designed in the manner shown in Fig. 4.

The lever E may be so constructed with reference to the length of itsslot that the latter may act to positively limit the length of stroke,so as to render the pump safe against unforeseen contingencies.

As mentioned above, the disk D or crankplate is operated by directconnection with the reciprocating piston-rod G, and several ways arepossible to make this connection; but preference has been given to theslotted lever E, secured to the disk-shaft, and the stud G, secured tothe piston-rod, to engage in the slotted lever As a direct modificationof this last device, we provide the disk-shaft with a steel rod, ofsuitable dimensions, to engage freely in a swiveling head or box, S,secured to the crosshead T of the piston-rod O by a wrist-pin or journalconnection. When the piston -rod is in motion, it carries the-box Salong in rectilinear motion, and vibrates the rod R, the box in theoperation swiveling in the head T and sliding on the rod R, the motionoperating to give the necessary curvilinear motion to the disk-shaft;.To act as a preventive against the jamming of the cylinder-heads at theends of the stroke, we provide the rod R with a stop-nut, V. The box Sis made in halves, in order to take up lost motion.

1'. The combination of the valve and rod K L of a steam-engine orsteam-pump, vibrating disk D connected to the piston-rod of the engine,and automatically-shifting slide F, the

parts being combined and operated substantially in the manner and forthe purpose specified.

2. The combination of valve and rod H L, disk or crank plate D, slide F,and spring M, operating substantially as and for the purpose specified.3. The combination of valve and rod H L, disk D, slide F, spring M, andcushion N n, operating substantially in the manner and for the purposespecified.

4, The curved guide P, in combination with the disk D and slide Ff,operating substantially as and for the purpose specified.

5. The curved guide P, having relief-spaces p, in combination with thedisk D and .shifting slide F f, substantiallyas specified. Intestimonyof which invention we hereunto set our hands.

JOHN TESSEYMAN. EDWARD E. BARNEY.

Witnesses:

. W. (J. HOWARD, JOHN HOWARD.

